[RFC PATCH v2] ptp: Add vDSO-style vmclock support

[David Woodhouse]

On Fri, 2024-06-28 at 13:33 +0200, Peter Hilber wrote:
> 
> > 
> >         /*
> >          * What time is exposed in the time_sec/time_frac_sec fields?
> >          */
> >         uint8_t time_type;
> > #define VMCLOCK_TIME_UNKNOWN            0       /* Invalid / no time exposed */
> > #define VMCLOCK_TIME_UTC                1       /* Since 1970-01-01 00:00:00z */
> > #define VMCLOCK_TIME_TAI                2       /* Since 1970-01-01 00:00:00z */
> > #define VMCLOCK_TIME_MONOTONIC          3       /* Since undefined epoch */
> > 
> >         /* Bit shift for counter_period_frac_sec and its error rate */
> >         uint8_t counter_period_shift;
> > 
> >         /*
> >          * Unlike in NTP, this can indicate a leap second in the past. This
> >          * is needed to allow guests to derive an imprecise clock with
> >          * smeared leap seconds for themselves, as some modes of smearing
> >          * need the adjustments to continue even after the moment at which
> >          * the leap second should have occurred.
> >          */
> >         int8_t leapsecond_direction;
> >         uint64_t leapsecond_tai_sec; /* Since 1970-01-01 00:00:00z */
> > 
> >         /*
> >          * Paired values of counter and UTC at a given point in time.
> >          */
> >         uint64_t counter_value;
> >         uint64_t time_sec; /* Since 1970-01-01 00:00:00z */
> 
> Nitpick: The comment is not valid any more for TIME_MONOTONIC.

Ah yes, I "moved" that comment up to the UTC/TAI time_type values, but
neglected to actually delete it from here. Fixed; thanks.
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